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ARM automatic resource management is another attractive features of Java 7 and project coin. Asname itself implies that now JVM is going to be handling all the external resource and make programmer free to bother about resource management. If my java programmers use any external resources like file, printer or any devices to close after my program execution complete. Normally we close the resources which we have open in beginning of our program or we decide that if program finish normally how to manage the resource or if our program finish abnormally how to close the resource.

But with java 1.7 we manage this thing very easily by try with resource block where inside try we mange this external resources.

Signature of Automatic Resource Management (ARM)

Signature is try(resource1;resource2){}after final resource ;semicolon is not allowed and the resource should be like var=expression type and bydefault all the resources are final type.

What has been added in API for Automatic Resource Management

java.lang.AutoCloseable, interface has been added in API which contains single method close() throws Exception this interface is a parent of java.io.closeable interface so all the input and output devices inherit this property.

Example of Automatic Resource Management (ARM) in JDK7

Here is example of automatic resource management with JDK 1.7 source base. Please make sure you run this with java source 1.7 otherwise you will get compilation error.

In this code inside try we have declare two file stream one is input file we are reading from one file and writing to another file. After the whole process both streams will be closed automatically either the code has been executed normally or not that means stockQuoteReader.close() and stockQuoteWriter.close() called automatically which is the best part of ARM.If we compare this with earlier example then if any exception occur during input file closing i.e. stockQuoteReader.close() , stockQuoteWriter.close() will never get executed so our code terminated abnormally.

Some important points which needs to be keep in mind when use ARM

§Whatever resource we are using should be subtypes ofAutoCloseable other wise will get compile time error.

§The resources which we are using are closed in reverse order means stockQuoteWriter.close() will be called first then stockQuoteReader.close().

That’s all on new automatic resource management (ARM) feature on JDK7, some how it address the cluttering of code due to checked exception handling and code duplication on several exception cache block.

automatic resource management Java in try statement is a great edition in JDK7. automatic resource management arm blocks jdk 7 is very convenient feature for java developers in only some respect automatic resource management article. What more is that ARM has been there for quite a while in other languages and Java has just adapted it.

I agree with @Anonymous here. Java 1.7 automatic resource management (ARM) improves code readability and stability by automatic closing orphaned resources and removing clutter from code. Only requirement is that resource must implement Closeable interface. Though Java 1.7 has retrofitted many Stream and IO classes to implement Closeable , you need to do this by your own Resources.